Update README.md

Netrvin · web-flow · commit 5556958e183e · 2019-10-04T16:20:38.000+08:00
diff --git a/README.md b/README.md
@@ -1,8 +1,8 @@
 # PageGuard.js
 
-**Warning: This script may not work in Chrome 77.**
-**Warning: This script may not work in Chrome 77.**
-**Warning: This script may not work in Chrome 77.**
+**Warning: This script may not work in Chrome 77.**  
+**Warning: This script may not work in Chrome 77.**  
+**Warning: This script may not work in Chrome 77.**  
 
 No copying, printing as well as opening developers tools.
 
